Britain's Prime Minister David Cameron, right, greets European Council president, Donald Tusk, at his official London residence, 10 Downing Street, ahead of crunch talks to finalise an EU reform package that could be backed by the rest of the 28-country bloc, Sunday Jan. 31, 2016. A deal at the next summit on February 18-19 is seen as vital if Cameron wants to hold a spring referendum on EU membership. (Jonathan Brady/PA via AP)  UNITED KINGDOM OUT
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